20045903 has 8 divisors (see below), whose sum is σ = 21049728. Its totient is φ = 19053144.

The previous prime is 20045887. The next prime is 20045929. The reversal of 20045903 is 30954002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20045903 - 2⁴ = 20045887 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1076 + ... + 6422.

It is an arithmetic number, because the mean of its divisors is an integer number (2631216).

Almost surely, 2^20045903 is an apocalyptic number.

20045903 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20045903 is a deficient number, since it is larger than the sum of its proper divisors (1003825).

20045903 is a wasteful number, since it uses less digits than its factorization.

20045903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5533.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 20045903 is about 4477.2651250512. The cubic root of 20045903 is about 271.6492695062.

Adding to 20045903 its reverse (30954002), we get a palindrome (50999905).

The spelling of 20045903 in words is "twenty million, forty-five thousand, nine hundred three".